Tier list using base opinions and zero matchup data!
Not a PMDT member, not a known player, fewer than 1000 SB posts so you probably won't take me seriously, just a guy with some opinions.
1. To put the letters in context, I'd call Fox an 8.5/10 character and Yoshi a 6. Arbitrary scale but hopefully adds a little bit of meaning and scope to the difference between top and bottom tier.
2. Some order in tiers, but I don't have comprehensive knowledge so arguing positions like +/- 4 placements is useless, although I want to hear opinions about things you think I'm completely off the mark with.
3. A+ tier I think could use a bit of toning down. These characters really have it all, even though they definitely have exploitable flaws.
4. A tier, maybe just a hint of tweaking. Some things I feel are a little too good right now, some things I could see being very good once optimized (Mewtwo's HC, his teleport cancel, Lucas's punish game, Lucario of course) but on the whole I don't see any "problems".
5. A- tier is just really solid. Maybe GW's Up B could use a bit of design change but that's a whole discussion on its own. Pikachu could definitely climb the ranks if his QAC is fully utilized but it's a very difficult thing to pull off consistently to the point where it's oppressive, and messing up can lead to death half the time...
6. B tier: This group is just missing something. Each character is generally fine but lacks a tool to really break through, like Ivy vs CC for example, or maybe Ness's recovery.
7. B- tier, this is where things start to fall off.
---Pit still feels incomplete to me, I firmly believe that he was overnerfed after 3.02 because of two of the world's best players representing him when he was a good character. Still working his way back up but has things that are still off. His Upsmash, his arrows, his Dtilt and Utilt... fix a few things and he's a solid character.
---Jigglypuff is still trying to figure out what to do. Her transition to PM is very very tough. On one hand, it's sensible to keep her playing like Melee Puff, but on the other her design is very very strange, and her playstyle struggles a bit more against some of the new characters. For the Melee top 8, when they "ported" over Fox and Falco and Sheik they were working with characters that were relatively complete, moveset-wise, outside of Chain. Falcon got buffs, Peach got buffs, Marth got a little bit of buffs, ICs got... that remains to be seen. But Jigglypuff has near-useless Specials outside of Rest. In a port where Falcon Kick and Raptor Boost and Peach Bomber all became actually good, we're left with Sing and Rollout.
---Charizard I'm iffy with his placement. I find his neutral to be strange because he has a great run speed but poor fall speed. He has far recoveries but they have little wiggle room and are commitments. He has strong kill options and good combo moves. I just feel like he's missing something. I don't know. Maybe he doesn't belong here but I certainly wouldn't put him higher than B tier.
---Yoshi... For no discernible reason he was gutted in 3.6. I found him a completely fine character and his recovery was smacked, his grabs were smacked, his weight was changed from PAL Melee to NTSC Melee. My favourite line in his 3.6 changelog is "Horizontal momentum: 0.125 -> 0.04" with regards to his aerial Egg Roll. It's terrible and it eats your jump, it's just not worth using and you're left with either use jump hight and end up way above stage, or drift more and then jump and you're recovering from below. Having an option like Squirtle's where you can Side B and then Up B (or for Yoshi's poor soul,
double jump and maybe get an airdodge) but probably with more endlag after Side B. I'm not here to propose Yoshi changes, just saying I think he really needs some.
8. F(ix) Tier
--- Bowser's neutral is what holds him back, we all know this. He punishes hard, can kill here and there, but him getting in is tricky, and once he fails to do that he's just combo food. As easy as it would be to give him back his old crazy Dash Attack to let him crunch right through moves, it was pretty brain dead and I know that PMDT (now fortified by Odds) can and will do much better.
Well feel free to pick me apart, I'ill explain placings.